While it sounds like a nasty intestinal parasite, Wire Worm is a plugin designed to rid your photographs of pesky unwanted artefacts (particularly wires). Like many modern Photoshop plugins and features, it does a lot of the heavy lifting automatically, calculating the replacement colour /tones and shapes from the surrounding background. And it does a pretty good job, cutting down on the need for fiddling around with endless cloning and other patching techniques.